Solar flares on April 20, 2001
The most powerful solar flare in 24 hours
M4.1 (strong) flare - April 20 at 11:04 PM
Solar activity index
Value as of the end of the day on April 20, 2001
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from April 19, 2001 to April 20, 2001
Time zone — UTC+03 (Vilnius)
List of solar flares for April 20, 2001
The total number of solar flares of class C and higher — 9 flares
C class — 7 | M class — 2 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| M4.1 | 22:51 | 23:04 | 23:16 | 9433 |
| C4.0 | 22:05 | 22:16 | 22:22 | 9433 |
| C2.2 | 21:20 | 21:32 | 21:39 | — |
| C1.8 | 19:54 | 19:58 | 20:01 | — |
| C4.2 | 17:07 | 17:17 | 17:28 | — |
| C7.0 | 15:53 | 16:04 | 16:17 | — |
| C1.5 | 11:46 | 11:50 | 11:53 | 9432 |
| C1.9 | 10:05 | 10:09 | 10:12 | 9433 |
| M1.0 | 08:01 | 08:23 | 08:43 | 9433 |